Sash-balance.



SCHOENHEIT.

SASH BALANCE. APPLICATION FILED MAR- 6, I914- RENEWED'DEC- 15, I914.

Patented July 20, 1915.

F/GJ

ATTYQ ERNEST scHonNEEIT, "on AMBRIYDGE, PENNSYLVANIA.

shear-BALANCE.

Application filed March 6, 1914, Serial No. 822,867. Renewed-December 15,1914; Serial No. 877,456.

To all whom it may concern:

Be it known that I, ERNEST SoHon Hnrr, a citizen of the United States, residing at Ambridg'efin the county of Beaver and" State of Pennsylvania, have invented cerand arrangement of parts to be hereinafter fully described in the following spec fication, pointed out in the claims and 1ll ustrated in the accompanying drawing wh ch forms a part of said specificatlon and in which-- Figure 1 is a front elevation, partly in section, of a window embodying my improvements. Fig. 2 is a cross sectlon taken on line 22 of Fig.1. Fig. 3 is a detail, in section, of the upper bearing. Flg. 1s a detail, in section, of the traveling friction bearing and automatic friction lock and 1s taken on line 44 of Fig. 6. Fig.5 is a section detail of the lower friction bearing. Fig. 6 is a section taken on line 6-6 of Fig. 1.

Like reference characters indicate corresponding parts throughout the several views.

1 is a vertically movable window frame disposed in the casing 2, 2. Within the side 2' of the casing a hollow invertedbearing 3 is secured by screws or other fastening means 4 and ball bearings 5 are disposed in said bearing to receive the recessed extremity of a shaft 6 which is also projected into said bearing. The shaft 6 extends from the inverted bearing 3 to and into a lower bearing 7 also disposed within the window casing and secured thereto by suitable fastening means 8 and said shaft is formed with a spiral groove 9 extending from end to end of the same.

Near the base of the window frame and to one lateral edge of the same a bearing comprising two separable cups 10, and 11 is secured by suitable fastening means 12 Specification of Letters Patent.

man anese, 1915.

and bearing portions areco'nriected by a screw 13 and theT'lower-portion ofthe bear-J mg or cup 11 is formed with; a circular ball race 14 in whi'chfball bearings"15 are disposed and in the hollow portions of said bearing a friction clutchv 16 is disposed provided with a tooth 17'adapted to ride in the grooved portion 9 of the shaft 6. The

.clutch 16 is positioned immediately above the ball bearings15 and is of such a size or vertical diameter with relation tothe hollowed portion of the bearing as to permit a limited movement in a vertical plane independently of said bearing. The clutch is beveled from its lower toward its upper extremity and conforms with the shape of the hollow of the bearing. When the window is raised the bearing 10, 11 carries the clutch with it, but the upward movement thrusts the clutch down upon the ball bearings and it rotates very easily about the shaft 6 permitting the easy ascent of the window, but when the window is lowered the clutch is wedged in its bearing above the ball bearings and forms a friction lock sufficiently strong to securely hold the window in an adjusted open position against the force of gravity. Manual pressure brought to bear upon the window will, however, close it or move it against the action of the clutch.

What is claimed is:

1. In a sash balance, a spirally grooved shaft disposed in the window casing, a hollow bearing carried by said window and encircling said shaft and means within said hollow bearing engaging the grooved portion of said shaft for facilitating the move- I ment of said bearing over said shaft in one direction and frictionally opposing said movement in the opposite direction.

2. In a sash balance, a spirally grooved shaft disposed in the window casing, a hollow bearing carried by said window and encircling said shaft, a clutch within said bearing, engaging the groovedportion of said shaft, whereby the movement of the bearing over said shaft in one direction is facilitated and said movement in an opposite direction is yieldingly opposed.

3. In a sash balance, a spirally grooved shaft disposed in the window casing, a hollow bearing carried by said window and encircling said shaft, a beveled clutch within said bearing engaging the grooved portion of said shaft to freely permit movement of said bearing over said shaft in one ing in one direction and to yielding'ly oppose such movement in the opposite direction.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature 1n the presence of tWo subscribing Witnesses.

ERNEST SCHOENHEIT. Witnesses:

JOHN LUDWIG, LUDWIG GRUBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of .Yatents,

' Washington, I). 0. 

